Set your speaker sample rate to 16-bit, 44100 Hz (CD Quality) in Windows Sound Settings.
For a "Full PC" experience, these are the verified platforms for purchasing and downloading the game: Call Of Duty- Modern Warfare 2 Indir -Full PC-
The original Modern Warfare 2 official multiplayer is due to remote code execution exploits. Hackers can install malware on your PC just by joining your lobby. Set your speaker sample rate to 16-bit, 44100